Hi,

In a school having 990 students 12 out of 27 are girls.

Let x represent the total amount of girls in the class

   |Cross Multiplying to solve

     x = 12*990/27

     x = 440, the number of girls.  550 boys  (990-440)



CHECKING our Answer***

 12/27 = 4/9 = 440/990 = 44/99 = 4/9 

Answer by algebrahouse.com(1659)   (Show Source): You can put this solution on YOUR website!
 If 12 out of 27 are girls,

then 15 out of 27 are boys.

There are 990 total.





15 boys / 27 total = x boys / 990 total {set up a proportion}

27x = 15(990) {cross-multiplied}

27x = 14,850 {multiplied 15 by 990}

x = 550





there are 550 boys


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